Develop Reference

Getting a ConnectionResetError when client script is stopped on UDP socket

I am making a script that will allow multiple clients to see live camera footage from the server script, this all works fine until one of the client scripts is closed, then a ConnectionResetError is raised, To avoid this I used a try and except block to catch the ConnectionResetError but the same error is raised every time after a connection is lost. Using just socket.recv stops the ConnectionResetError but socket.recv does not return the senders address which is required for the script to send the video stream back to the client.
Server:
host = "0.0.0.0"
port = 5000
buffer_size = 1024
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(("", port))
listeners = list() # the addresses of the clients that want the video stream
def handle_queue(sock):
while True:
try:
message, address = sock.recvfrom(buffer_size) # block the thread until a packet arrives
print(address)
message = str(message, "utf-8") # decode the message
if message == "join":
listeners.append(address) # add the list of listeners
else:
print("unknown queue msg: ", message)
except ConnectionResetError:
print("The connection was forcefully quit")
queue_handler_thread = Thread(target=handle_queue, args=(sock,), daemon=True)
queue_handler_thread.start() # start the queue
the script then uses sock.sendto() for each address in the listeners list
Client:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(bytes("join","utf-8"), (host, port))
while True:
data, address = sock.recvfrom(max_length) # block main thread until a packet is received

I believe what you are looking for is socket.getpeername().
This will return the remote address to which the socket is connected.
Your approach in handling the data in the wire whilst the connection is closed/lost is the right way. Handling via try/catch or using a recv() or recvfrom() method to wait for a response before closing the socket.

Since posting this i have discovered that it is infact TCP and this will not work for the project I am trying to do. Any more guidance and help would be appreciated, I cant seem to find any examples of Multiclient UDP Servers that run through one socket.
I partially resolved my system, after using the Example provided by AztCrw4282.
I was able to find a solution, I instead used the socket.accept() aproach, I am unsure as to whether this is UDP or TCP (I want UDP but with the connect system I think that is the handshake for TCP, but I am not 100% sure), but it works for now.
The client has to connect to the server then the server will accept or deny the connection, upon accepting a thread will be created for that clients connection to be managed. If any errors are thrown when interacting with that client their connection will be closed.
Server
try:
ServerSocket.bind((host, port))
except socket.error as e:
print(str(e))
print('Waiting for a Connection..')
ServerSocket.listen(5)
connections = list()
def threaded_client(connection):
connection.send(str.encode('Welcome to the Server\n'))
while True:
try:
data = str(connection.recv(2048),"utf-8") # this needs to be try catched
print("Packet Recv: ", data)
if data == "join":
print("Client Joined")
if data == "quit":
break
if not data:
break
except ConnectionResetError:
break
print("Closing a connection") # need to handle leaving the stream
connection.close()
def handle_stream():
for connection in connections:
try:
connection.send(bytes(json.dumps(frame_info) ,"utf-8"))
except:
print("Packet send failure, kicking client")
connections.remove(connection)
while True:
Client, address = ServerSocket.accept()
print('Connected to: ' + address[0] + ':' + str(address[1]))
connections.append(Client)
Thread(target=threaded_client, args=(Client, ), daemon=True).start()
ThreadCount += 1
print('Thread Number: ' + str(ThreadCount))
The only part that changes for the client is the part where it connects to the server
try:
ClientSocket.connect((host, port))
except socket.error as e:
print(str(e))

How to know if a non-blocking socket is closed?

I'm trying to write my own TCP Non-Blocking Server to handle multiple long lasting socket connections rather than opening many threads to handle them.
I've written my over-complicated, hard to use syntax but have the issue forms when I'm trying to detect a closed socket.
In a normal threaded TCP Socket Server I would use detected a b'' from the socket.read(size) function, However this is not possible with a nonblocking socket as it will always return a BlockingIOError
I have also tried catching theese following events
except BrokenPipeError:
conn.abort()
except ConnectionResetError:
conn.abort()
except ConnectionAbortedError:
conn.abort()
except socket.error:
conn.abort()
(conn is a class that houses the client socket and address from socket.accept())
I'm unsure what to do, but here is a deeply simplified extract from my code:
def loop_listen(self):
while self.running == True:
cr, addr = self.server.accept()
crs = SocketHandler(self, cr, addr)
self.client_handler(crs)
self.connections.append(crs)
crs.events["open"]()
crs.cr.setblocking(0)
def loop_recv(self):
while self.running == True:
time.sleep(self.poll_time)
for conn in self.connections:
try:
data = conn.cr.recv(self.poll_size)
print(data)
if (data == b''):
conn.abort()
except BlockingIOError:
data = None
except BrokenPipeError:
conn.abort()
except ConnectionResetError:
conn.abort()
except ConnectionAbortedError:
conn.abort()
except socket.error:
conn.abort()
if (data != None):
conn.events["msg"](data)
(Both loops are separate threads)
And incase you wanted it, here is the conn class
class SocketHandler:
def __init__(self, server, cr, addr):
self.server = server
self.cr = cr
self.addr = addr
self.events = {"msg": emptyCallback, "close": "emptyCallback","open":emptyCallback}
self.cache = b""
def message(self, func):
self.events["msg"] = func
def close(self, func):
self.events["close"] = func
def open(self, func):
self.events["open"] = func
def send(self, data):
self.cr.send(data)
def abort(self):
self.cr.close()
self.events["close"]()
self.server.connections.remove(conn)
This works fine on Windows but on Ubuntu it does not call the conn.abort().
Any help would be greatly appreciated.
Thanks, Sam.

The official way to detect a closed connection on a non-blocking socket is exactly the same as blocking sockets. They return empty data from recv().
Example:
# Server
import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('localhost', 12345))
s.listen(1)
while True:
conn, addr = s.accept()
conn.setblocking(0)
print("New connection from " + str(addr) + ".")
while True:
try:
data = conn.recv(1024)
if not data:
break
print("Received:", data)
except BlockingIOError:
time.sleep(0.001)
print("Closed.")
# Client
import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('localhost', 12345))
for i in range(5):
time.sleep(0.3)
s.send(str(i).encode('utf-8'))
s.close()
There is one special case where this won't work, as described in the official docs, section When Sockets Die. It happens, when sockets don't shut down gracefully. There basically is no way for recv() to detect when a socket is dead without a graceful shutdown. It might be that this is what you are seeing.
There are multiple ways to resolve that. For one, create some kind of timeout that closes and discards a socket if it didn't receive a message for a sensible amount of time. Secondly, you could actively send messages. Detecting a dead socket is much easier for send() than for recv().
Further, this works on Linux. I didn't test it on Windows. The internal implementation of the sockets class is very platform dependent, so it might be a Windows bug.

Python long-lived socket connection weirdness

I've implemented some code that allows a client to connect to a socket server, introduces itself and the server then goes into an infinite loop which sends "commands" (strings) to the client from a Redis list. The server uses the Redis 'blpop' method to block until a string arrives which is then sent off to the client and the response awaited.
However, in testing (with a python client socket script on another local workstation) I find that if I break the client connection (Ctrl+c) to simulate an interruption in the connectivity, the server happily writes the next received string to the client, reports an empty response but ONLY throws the broken pipe exception when a second string is written :/ Thus, two writes are "lost" before anything is caught. Here's my code:
# Create global Redis resource
rds_cnx = redis.StrictRedis(host='localhost', port=6379, db=6)
def initialise_server():
""" Setup server socket """
try:
srv_skt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
srv_skt.bind((IP, PORT))
srv_skt.listen(1)
print("Listening on:[{}]".format(IP, PORT))
return srv_skt
except socket.error as skt_err: # e.g. port in use
print("Could not initialise tcp server:[{}]".format(skt_err))
sys.exit(1)
except Exception as exp:
print("Unable to setup server socket:[{}]".format(exp))
sys.exit(1)
def main():
server_socket = initialise_server()
while True:
client_socket, remote_address = server_socket.accept()
try:
# Block and wait for connection and data
initial_data = client_socket.recv(1024).decode()
print("Connection from [{}] - Data:[{}]".format(remote_address, initial_data))
while True:
wait_for_queue_command(client_socket)
except (BrokenPipeError, socket.error, Exception) as sck_exp:
print("Exception in client loop:[{}]".format(sck_exp))
continue
except KeyboardInterrupt:
# Close client socket
client_socket.shutdown(2)
client_socket.close()
print('Caught Ctrl+c ... Shutting down.')
break
# Tear down context
server_socket.shutdown(2) # Param ref: 0 = done receiving, 1 = done sending, 2 = both
server_socket.close()
def wait_for_queue_command(client_skt):
""" Blocking while waiting for command for Redis list
:param client_skt: socket
:return: None
"""
print('Waiting for command...')
queue_cmd = rds_cnx.blpop('queuetest', 0)
print("Received something from the queue:")
pprint(queue_cmd)
try:
#client_skt.settimeout(15)
client_skt.send(queue_cmd[1])
# Block for response
response_data = client_skt.recv(1024).decode()
print("Response:[{}]".format(response_data))
except BrokenPipeError as brkn_p:
print('Outbound write detected "Broken Pipe":[{}]'.format(brkn_p))
''' Here one would decide to either re-schedule the command or
ignore the error and move on to the next command. A "pause"
(sleep) could also useful?
'''
raise
except socket.timeout as sck_tmo:
print('Socket timed out:[{}]'.format(sck_tmo))
except socket.error as sck_err:
print('Socket timed out:[{}]'.format(sck_err))
raise
print('Command handling complete.')
Is there any better way to handle such a situation? I've had a cursory look at Twisted but it seems very difficult to achieve the specific blocking behavior and other code that might be implemented to handle specific responses from the client.

Python socket server users are not able to connect after certain time

i'm new on stackoverflow and have a question.
I wrote a python websocket server and it works fine. But after a while new connections are not able. Chrome shows that the websocket stays on pending state. The server does not return any error.
My thoughts were that the unaccepted socket queue could be full, but even by increasing it to the socket.SOMAXCONN the server doesn't accept connections after a while.
My next thought was that the threads dont have enough stack memory, but also by increasing the memory the problem still exists.
Some code:
def start_server(self, port):
s = socket.socket()
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(('', port))
s.listen(socket.SOMAXCONN)
while(1):
try:
conn, addr = s.accept()
threading.Thread(target = self.handle_client, args = (conn, addr)).start()
self.LOCK.acquire()
UserManagment.append(-1, conn)
self.LOCK.release()
except Exception as e:
print("An error occured: ", str(e))
threading.stack_size(524288)
ws = WebSock()
ws.start_server(443)
I hope someone of you can help me.
Kind regards

Python Server send data not working

I am currently working on a server in Python, the problem I am facing is the client could not retrieve the sent data from server.
The code of the server is:
import sys
import socket
from threading import Thread
allClients=[]
class Client(Thread):
def __init__(self,clientSocket):
Thread.__init__(self)
self.sockfd = clientSocket #socket client
self.name = ""
self.nickName = ""
def newClientConnect(self):
allClients.append(self.sockfd)
while True:
while True:
try:
rm= self.sockfd.recv(1024)
print rm
try:
self.sockfd.sendall("\n Test text to check send.")
print "Data send successfull"
break
except socket.error, e:
print "Could not send data"
break
except ValueError:
self.sockfd.send("\n Could not connect properly")
def run(self):
self.newClientConnect()
self.sockfd.close()
while True:
buff = self.sockfd.recv(1024)
if buff.strip() == 'quit':
self.sockfd.close()
break # Exit when break
else:
self.sendAll(buff)
#Main
if __name__ == "__main__":
#Server Connection to socket:
IP = '127.0.0.1'
PORT = 80
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.setsockopt( socket.SOL_SOCKET, socket.SO_REUSEADDR,1)
print ("Server Started")
try:
serversocket.bind(('',5000))
except ValueError,e:
print e
serversocket.listen(5)
while True:
(clientSocket, address) = serversocket.accept()
print 'New connection from ', address
ct = Client(clientSocket)
ct.start()
__all__ = ['allClients','Client']
#--
And the client connecting is:
import socket
HOST = '192.168.1.4' # The remote host
PORT = 5000 # The same port as used by the server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
data = s.recv(1024)
s.close()
print 'Received', data#repr(data)
In need of a quick solution....
Thanks,

I tested out your code, and when I commented out
rm= self.sockfd.recv(1024)
print rm
it worked fine. Basically the server stopped there to wait for a message that never came. If it still does not work for you, there might be two problems. Either you have a firewall that blocks the connection somehow, or you have old servers running in the background from previous tries that actually wasn't killed. Check your processes if pythonw.exe or equivalent is running when it shouldn't be, and kill it.

To wait for response:
with s.makefile('rb') as f:
data = f.read() # block until the whole response is read
s.close()
There are multiple issues in your code:
nested while True without break
finally: ..close() is executed before except ValueError: ..send
multiple self.sockfd.close()
etc
Also you should probably use .sendall() instead of .send().

your server code is excepting client send something first,
rm= self.sockfd.recv(1024)
but I don't see any in your code
please try send something in your client code
s.connect((HOST, PORT))
s.send("hello")

Short solution
Add a short sleep after connect.
import time
time.sleep(3)